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The rubber donut seals between the upper and lower parts of the intake manifold might be worth replacing if you have everything apart. They can cause air leaks that upset mixture. I have not had that problem on my 72, but others have.

I would have a good look for cracks on the exhaust manifolds. Maybe at least replace the gaskets.

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Pretty much anything rubber on the engine. Detail engine bay while engine is out. If you want to go all the way yellow zinc replate all the pipes, brackets, hardware, and all the clips and plated parts around the engine bay. If you have a bead blast cabinet then the plating is probably @$200.

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I pulled my engine in 2009 and had it rebuilt. While it was at the "spa" I took the opportunity to check the wiring harness and replace some cooked wires. I also looked at the firewall insulation and repaired it where necessary and then sprayed it with a rubberized silver paint. I do not remember where I got that paint though. I replaced all the steering and suspension bushings at that time as it was far easier w/o the engine in the way. I also checked and replaced some of the vacuum tubing along side the firewall and in back ot the engine...alot easier to work on w/o the engine in the way!
Good Luck

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It all depends if you're willing to pull apart heads and bottom end.
If you are, you could only benefit from honing the cylinders, replacing the rings, conrod bearings, and perhaps the crank bearings, opening up ports in heads and reseating valves.Cleaning combustion chamber pertinent parts too.
Silly to do all this if you are absolutely sure the engine is VGC but sillier not to do it whilst the engine is out and some doubt on condition exists.
my two bobs worth of opinion

I've just checked these posts https://www.benzworld.org/search/48170/?q=slc+rear+brakes+won%27t+bleed&o=relevance and I'm not sure they are relevant for me.
1979 450 SLC 5.0 - 107026
Fronts bleed
Rears don't, neither by manually pumping or me using a vacuum.
Disconnected rear brake line at the...

So here is the story, the car has covered about 600 miles since its 3 year body restoration. Since there was a misfire on cylinder 1 before I put the car back on the road (oiled plug), I replaced the plug and just cleaned up the others. I did a compression test at the start of the year and the...

Photos of my 1973 450SL taken in July 2009 at about mid stage in a 4 year detail restoration. When complete every single detail was attended to including re-plating every cadmium part in the engine bay, finding decals and if decals were not available replicas were made. Spark plug wires had the...

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